condition mean min max ZT0-3 2159.2 2159.2 2159.2 ZT4-7 3206.4 3206.4 3206.4 ZT8-11 3554.95 3554.95 3554.95 ZT12-15 3584.7 3584.7 3584.7 ZT16-19 2682.3500000000004 2682.3500000000004 2682.3500000000004 ZT20-23 2036.8000000000002 2036.8000000000002 2036.8000000000002